Year 8 Science · Unit 3 · Lesson 15

Unit 3 Synthesis and Depth Study Preparation

Foundation Worksheet

Name

Date

Class

Learning Goals

Recall and use key vocabulary from across Unit 3: Change in Matter.
Organise core concepts from the unit into themed groups.
Demonstrate understanding of how the unit's big ideas connect.

Warm Up

Fill the gap

Choose the correct word from the word bank to complete each sentence. Two words will not be used.

chemical change physical change conservation of mass independent variable controlled variable word equation anomaly reliability carbon cycle

When iron rusts, a new substance is formed — this is an example of a because a new substance with different properties is produced. Melting ice is a because the substance is the same — only its state changes. In an investigation, the factor you deliberately change is called the . Every factor that is kept the same to ensure a fair test is called a . When scientists repeat an experiment many times and get similar results, this improves the of the data. A result that does not fit the pattern in your data is called an , and it should be investigated rather than ignored. The law of states that the total mass of reactants always equals the total mass of products.

Your Turn

Sort it!

Write each concept from the pool into the correct theme box. Each concept belongs in exactly one box.

identifying reactants and products calculating an average particle model of bond breaking freeze-thaw weathering controlled variable line graph vs bar chart combustion in the carbon cycle word equation hypothesis acid rain dissolving limestone identifying anomalous results conservation of mass

Theme 1: Investigation Design

Theme 2: Collecting and Interpreting Data

Theme 3: Modelling Chemical Change

Theme 4: Change in Natural and Human Systems

Show What You Know

1. Explain what evidence of a chemical change you would expect to observe if you added a piece of zinc to hydrochloric acid. Name at least three signs.

Recall 2 marks

2. A friend says: "I don't need to repeat my experiment — I got a clear result the first time." Using what you know from Unit 3, explain why this approach is a problem for scientific investigations.

Recall 2 marks

Wrap Up

Write three key ideas from Unit 3 — Change in Matter.